Perl: if ( element in list )

Question

I\'m looking for presence of an element in a list.

In Python there is an in keyword and I would do something like:

if element in list:
            


        

Answer 1

List::Util::first

$foo = first { ($_ && $_ eq "value" } @list;    # first defined value in @list

Or for hand-rolling types:

my $is_in_list = 0;
foreach my $elem (@list) {
    if ($elem && $elem eq $value_to_find) {
        $is_in_list = 1;
        last;
    }
}
if ($is_in_list) {
   ...

A slightly different version MIGHT be somewhat faster on very long lists:

my $is_in_list = 0;
for (my $i = 0; i < scalar(@list); ++$i) {
    if ($list[i] && $list[i] eq $value_to_find) {
        $is_in_list = 1;
        last;
    }
}
if ($is_in_list) {
   ...